From eb64ecf0907c2a2deae0687592eb3910e9c328cc Mon Sep 17 00:00:00 2001
From: JadSark <s306987@studenti.polito.it>
Date: Thu, 14 Dec 2023 16:19:13 +0100
Subject: [PATCH] Bug027 fixed

---
 source/BUG/strings.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/source/BUG/strings.py b/source/BUG/strings.py
index 426b84e..0410fa5 100644
--- a/source/BUG/strings.py
+++ b/source/BUG/strings.py
@@ -50,7 +50,11 @@ def replace_substring(s: str, old_sub: str, new_sub: str) -> str:
     """
     BUG027: replace_substring should replace occurrences of old_sub with new_sub, not append new_sub.
     """
-    result = s + new_sub
+    result = s 
+    index=result.find(old_sub)
+    while index != -1:
+        result= result[:index] + new_sub + result[index+len(old_sub):]
+        index=result.find(old_sub)
     return result